A166498 Integers formed by concatenating squares.

0, 1, 4, 9, 10, 11, 14, 16, 19, 25, 36, 40, 41, 44, 49, 64, 81, 90, 91, 94, 99, 100, 101, 104, 109, 110, 111, 114, 116, 119, 121, 125, 136, 140, 141, 144, 149, 160, 161, 164, 169, 181, 190, 191, 194, 196, 199, 225, 250, 251, 254, 256, 259, 289, 324, 360, 361

Offset: 1

Author

Zak Seidov, Oct 15 2009

Keywords

• base
• nonn

Examples

			11 being the concatenation of 1 and 1, both squares, is in the sequence.
120 is not in the sequence as none of 2, 12, 20 and 120 are squares. - corrected by _Peter Munn_, Nov 17 2017
		

Crossrefs

Cf. A000290 (squares), A152242 (integers formed by concatenating primes).

Programs

Mathematica

Take[FromDigits[Flatten[IntegerDigits/@#]]&/@Tuples[Range[0,20]^2,3]//Union,60] (* Harvey P. Dale, May 25 2025 *)

Extensions

Corrected and extended by Michel Marcus, Oct 16 2013

Mispositioning of example corrected by Peter Munn, Nov 17 2017